Nonlinear Blind Source Separation by Integrating Independent Component Analysis and Slow Feature Analysis

In contrast to the equivalence of linear blind source separation and linear independent component analysis it is not possible to recover the original sourcesignal from some unknown nonlinear transformations of the sources using only the independence assumption. Integrating the objectives ofstatistical independence and temporal slowness removes this indeterminacy leading to a new method for nonlinear blind source separation. Theprinciple of temporal slowness is adopted from slow feature analysis, an unsupervised method to extract slowly varying features from a given observed vectorial signal. The performance of the algorithm is demonstrated on nonlinearly mixed speech data.